Public bug reported:
Info on overlayroot: http://blog.dustinkirkland.com/2012/08/introducing-
overlayroot-overlayfs.html
Mount configuration for an overlayroot-configured box:
$ mount
overlayroot on / type overlayfs (rw,errors=remount-ro)
/dev/sda5 on /media/root-ro type ext3
(ro,relatime,errors=continue,user_xattr,acl,barrier=1,data=ordered)
/dev/sda6 on /media/root-rw type ext3
(rw,relatime,errors=continue,user_xattr,acl,barrier=1,data=ordered)
/dev/sda1 on /boot type ext3 (rw)
When attempting to update-grub:
$ sudo update-grub
[sudo] password for administrator:
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
The issue comes about in this line of the /usr/sbin/grub-mkconfig
script:
GRUB_DEVICE="`${grub_probe} --target=device /`"
In the short term, I'm hacking that script to pass in a value for
GRUB_DEVICE, but the ideal would be to have the grub-probe binary detect
when an overlayfs is / and return the device which is the bottom of the
overlay.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1247905
Title:
update-grub fails in the face of overlayroot
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